I struggled with wether or not to add this to the economy threads, but I think we all missed a great hedge - the Michelin PS2. They're over $2,000 for the set now in my size!
While installing the Club number brace last weekend, I noticed that it's time for some new rubber (past actually). So, I started looking on TireRack for options. As I'm running the 19" Style 166 from the E60 M5, there a few more options than the OE 18", including plenty of remaining stock on the PS2. While I'm a little concerned at the age of the rubber in these last lots of PS2s (probably not too big of an issue), the price is just silly.
After reading around on the M5 board, I'm considering the Continental ExtremeContact DW for my next tire. While the new PSS would be great, the rears are slightly off from the standard size (although, I've read they run wide). The Conti's get consistently good reviews, and they may be a tad softer. Since I'm not tracking the car and I don't ever get close to the limit of grip, a little softer tire might be a great move for comfort and protection. Plus, at only $1,100 for the set, they're a bargain.
I'm running the Conti DWS on the X5, with good results. Any thoughts on the DW for the Z8?